Question: Which is the mineral variety that starts with the letter z?
Paraphrase: Name the mineral variety that starts the letter z.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q429795 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'z')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: zeiringite, zeiringite